Pen



FIG. 1 is a top left front perspective view of a pen;

FIG. 2 is a top plan view of the pen of FIG. 1;

FIG. 3 is a left side elevation view of the pen of FIG. 1, which is a mirror image of the right side view;

FIG. 4 is a front elevation view of the pen of FIG. 1;

FIG. 5 is a back elevation view of the pen of FIG. 1; and,

FIG. 6 is a bottom plan view of the pen of FIG. 1. 

The ornamental design for a pen, as shown and described. 